Let’s debrief your volume work from Activity 8 last class. get out WS 8.1b/c we need to all be “on the same page” now or all future work will be “off”

When an object has measurable sides Measuring When an object has measurable sides

ruler ruler ruler ruler ruler ruler 7.2 cm3 7.2 cm3 V =𝜋𝑟2ℎ 5.7 cm3 L=1.2 cm W=1.2 cm H=5 cm L x W x H 1.2 x 1.2 x 5 7.2 cm3 L x W x H 1.2 x 1.2 x 5 ruler L=1.2 cm W=1.2 cm H=5 cm 7.2 cm3 L=2.5 cm W=2.5 cm H=2.5 cm ruler L x W x H 2.5 x 2.5 x 2.5 15.6 cm3 L=2.5 cm W=2.5 cm H=2.5 cm L x W x H 2.5 x 2.5 x 2.5 ruler 15.6 cm3 V =𝜋𝑟2ℎ ruler 5.7 cm3 D= 1.2cm H=5 cm 3.14 x .62 x 5 V =𝜋𝑟2ℎ ruler D= 1.2 cm H=5 cm 5.7 cm3 3.14 x .62 x 5

When an object does not have measurable sides Displacement When an object does not have measurable sides

N/A N/A 8 mL 8 mL 6 mL 6 mL Vf-Vi 38 – 30 Vf-Vi 38 – 30 Vf-Vi 36 – 30 Vi=30 mL Vf=38mL 8 mL displacement Vf-Vi 38 – 30 Vi=30mL Vf=38mL 8 mL displacement N/A N/A Vf-Vi 36 – 30 6 mL displacement Vi=30 mL Vf=36mL Vf-Vi 36 – 30 Vi=30 mL Vf= 36mL displacement 6 mL

If you use a tool capable of more accuracy (on target) and precision (repeated accuracy), you will get better measurements/results. best tool: digital calipers

digital calipers If you use a tool capable of more accuracy (on target) and precision (repeated accuracy), you will get better measurements/results.

L=1.27 cm W=1.27 cm H=5 cm L x W x H 1.27 x 1.27 x 5 digital calipers 8 cm3 L=1.27 cm W=1.27 cm H=5 cm L x W x H 1.27 x 1.27 x 5 digital calipers 8 cm3 L=2.54 cm W=2.54 cm H=2.54 cm L x W x H 2.54 x 2.54 x 2.54 digital calipers 16.4 cm3 L=2.54 cm W=2.54 cm H=2.54 cm L x W x H 2.54 x 2.54 x 2.54 digital calipers 16.4 cm3 V = 𝜋𝑟2ℎ 3.14 x .642 x 5 digital calipers D= 1.27 cm H=5 cm 6.1 cm3 V = 𝜋𝑟2ℎ 3.14 x .642 x 5 digital calipers D= 1.27 cm H=5 cm 6.1 cm3

Sept 26 / 27 Act A9 Measuring Mass, Calculating Density LEARNING TARGET: I can mathematically determine an objects’ density by using its mass and volume. CH Q How can you use the mass and volume of an object to calculate its density? VOCAB: Density; mass; qualitative; quantitative; volume; weight

VOCAB: Density Mass Qualitative Quantitative Volume weight = mass / volume "stuff" Describe with words Describe with numbers "space" changes due to gravity

What is the formula for density?? DISCUSSION What is the difference between mass and volume? Compare the densities of gray materials? What is the formula for density??

PROCEDURE: Read on pg. A-37-39 and summarize PROCEDURE AND DATA MATERIALS: PROCEDURE: Read on pg. A-37-39 and summarize DATA: WS 9.1 Mass, Volume and Density of Six Objects WS 9.2 Identifying Objects’ Material Using Density

Does the density change if the size changes? POST DISCUSSION Does the density change if the size changes? What do you think will happen to the density of the clay if it is cut in half? if Volume changes, then mass will change proportionately (the same “amount”)

If a piece of clay has a mass of 10g and a volume of 5cm3 (density 2g/cm3) is cut in half, what will be the density of the two new pieces of clay? Explain your reasoning. The density will stay at 2g/cm3, if Volume changes, then mass will change proportionately (the same “amount”)

ANALYSIS Discuss and answer Q 2 on pg. A-40 Density of Water = 1g/cm3

Unit A Quiz ( Oct 01 / 02) ANS CH Q How can you use the mass and volume of an object to calculate its density? A: HOMEWORK Analysis Question 3 a-e on pg A-40 HINT : Write Formulas and SHOW all work HINT : 3e needs two diagrams (before and after) along with labels, computation and explanation. (Take a photo OR use SEPUP website to find questions if needed) Unit A Quiz ( Oct 01 / 02)

Review Day Prepare a review sheet (Study Guide) for each activity we have completed. You may use the front and back of one piece of paper to write all of the important aspects learned in this unit At least 2 take-aways from each lesson.

There is a study guide on website!!!  Review all Documents on website as part of your review. Good Night’s Sleep and Eat Good Breakfast Due On Quiz day Vocab Packet All WS handed out through unit (9)